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  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
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  <title>Document</title>
  <style>
  .title {
    color: red
  }
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<body>
  
  <p 属性名="属性值">我是标题</p>
  <h1 class="title" id="abc">我是标题</h1>
  <h1>我也是标题</h1>
  <!--超链接元素-->
  <a href="http://www.baidu.com">百度一下</a>
</body>
</html>